Bad Customer care service on ***** case.

Someone did a SIM Swap on my phone line without my permission and purchase giga gifts. Not once was I ask for a OTP or any security questions. I did logged a call with Cell C's ***** department. On the first case they closed because there was not enough information, but not once was I contact for any information or clarifications. On the second one was closed because I was not able to pick up while I were in a meeting. On the third one I am getting for almost 2 months no reply or response with numerous emails and calls. Cell C was also saying at hat I am not clear in each case what I want them to do, but each call was looks by the sales persons in store and I can confirmed that they did explain each time clearly what needs to happen. Now I am not able to pay this huge amount that was **********ly procured on my account and Cell C is threatening me for the payment. This going for the third month with no interest or feedback given. When I tried to explain to the accounts department that there was already 3 ***** case logged and I would like to know how to escalate this. The line was dropped while I was still speaking, and I am sure I was not rude with him. My personal information leaked out by Cell C caused me to change my number and bank accounts to stop other ********** activities. It seems any random person can be help 10 times a day to lift my account limit and buy giga gifts, but if your are a loyal customer for years, your not worth the effort.